package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;


    @Override
    public Result sendCode(String phone, HttpSession session) {

        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.手机号校验不通过，发送报错信息
            return Result.fail("手机格式错误！");
        }


        //3.手机号校验通过，生成验证码
        String code = RandomUtil.randomNumbers(6);

//        //4.保存验证码到session
//        session.setAttribute("code", code);

        //4.保存到redis中，保留2分钟
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);


        return Result.ok(code);
    }

    @Override
    public Result login(LoginFormDTO dto, HttpSession session) {

        //1.校验手机号
        String phone = dto.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误！");
        }
        //2.校验验证码
        //2.1从redis中取验证码
        if (dto.getCode() == null && !dto.getCode().equals((String) stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone))) {
            //3.不一致，返回错误信息
            return Result.fail("验证码错误！");
        }
        //4.一致，查询手机号用户信息
        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
        if (user == null) {
            //6.用户不存在，创建新用户，保存用户信息到数据库
            user = createUserWithPhone(phone);
        }


        //7.保存用户信息到redis
        //7.1随机生成一个token，作为登录令牌

        String token = UUID.randomUUID().toString(true);
        //7.2将user对象转成hash
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //7.3存到redis
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(), CopyOptions.create().
                setIgnoreNullValue(true).
                setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token, userMap);
        //7.4数据设置一个有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES);

        //8.返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }


}
